Natural gas and hydrogen energy co-combustion corner tube type steam hot water boiler

Abstract

The utility model relates to the technical field of boilers, in particular to a natural gas and hydrogen energy co-combustion corner tube type steam hot water boiler. Comprising a boiler body and a conveying mechanism, and the conveying mechanism comprises a static mixer, a mixing conveying pipe, a safety valve, a pressure gauge, a branch pipe, a hydrogen pressure reducing valve, a hydrogen filter, a hydrogen flow meter and a natural gas conveying device. Hydrogen generated by working of an external device is filtered through the hydrogen filter and decompressed through the hydrogen pressure reducing valve and then conveyed into the mixing conveying pipe, then mixed gas is conveyed into the static mixer to be mixed, finally the mixed gas is conveyed into a combustor of the boiler body, and the safety valve can be used for safety protection after the mixed gas is mixed. And the pressure gauge can facilitate direct observation of the pressure of the mixed gas, so that the recovered hydrogen can be mixed into the natural gas for combustion, reasonable utilization of resources is realized, improvement of the combustion efficiency and the emission performance of the boiler is facilitated, and the boiler is convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, and in particular to a natural gas-hydrogen co-firing corner tube steam hot water boiler. Background Technology

[0002] Conventional large-capacity natural gas-fired hot water boilers typically adopt a Π-shaped structure with a boiler drum at the top. This results in high product design costs, long manufacturing cycles, and a boiler design thermal efficiency of around 90%. Additionally, the owner's investment costs are also substantial.

[0003] Existing technology CN202109648U discloses a horizontal natural gas-fired hot water boiler, including a burner, furnace, flue, and economizer. The furnace adopts a fully membrane-type wall-sealed structure composed of a front water-cooled wall, a side water-cooled wall, and a rear water-cooled wall. Two burners are arranged at the front water-cooled wall. At the furnace outlet where the flue gas passes, two rows of slagging tubes are arranged on the rear water-cooled wall. After the two rows of slagging tubes, a high-temperature convection tube bundle is arranged. A sealing device is arranged after the high-temperature convection tube bundle. The boiler is welded to the expansion joint, which is then welded to the flue. The flue is connected to the economizer. The economizer outlet header is connected to the lower header of the front water-cooled wall. The upper header of the front water-cooled wall is connected to the upper header of the side water-cooled wall via a connecting pipe. The upper header of the side water-cooled wall is connected to the inlet header of the convection tube bundle via a connecting pipe. The outlet header of the convection tube bundle is connected to the hot water outlet pipe. The economizer inlet header, outlet header, and convection tube bundle inlet header and outlet header are all vertically arranged and located outside the flue. This utility model has a reasonable design, simple structure, horizontal drum-less arrangement, low metal consumption, simple manufacturing, and a boiler thermal efficiency of ≥94%.

[0004] However, in actual use, many factories produce hydrogen as a byproduct of their production facilities, but the supply is insufficient to support a boiler system that burns hydrogen alone. Furthermore, there is not enough scale to purify and compress such hydrogen sources. As a result, many factories fail to effectively utilize hydrogen and mostly release it directly into the atmosphere, leading to the waste of this clean and high-quality energy and limiting the use of boilers. Utility Model Content

[0005] The purpose of this invention is to provide a natural gas-hydrogen co-firing corner tube steam-hot water boiler that can mix recovered hydrogen into natural gas for combustion, thereby achieving rational utilization of resources, improving boiler combustion efficiency and emission performance, and facilitating boiler use.

[0006] To achieve the above objectives, this utility model provides a natural gas-hydrogen co-firing angle tube steam-hot water boiler, including a boiler body and a conveying mechanism;

[0007] The conveying mechanism includes a static mixer, a mixing and conveying pipe, a safety valve, a pressure gauge, a branch pipe, a hydrogen pressure reducing valve, a hydrogen filter, a hydrogen flow meter, and a natural gas transmission device. The static mixer is installed outside the air inlet of the burner in the boiler body. The mixing and conveying pipe is installed on the air inlet side of the static mixer. The safety valve and the pressure gauge are respectively screwed onto the mixing and conveying pipe. The branch pipe is welded to the rear of the air inlet side of the mixing and conveying pipe. The hydrogen pressure reducing valve is installed on the air inlet side of the branch pipe. The hydrogen filter is installed on the air inlet side of the hydrogen pressure reducing valve and is connected to an external hydrogen conveying pipeline. The hydrogen flow meter is installed on the branch pipe. The natural gas transmission device is installed on one side of the mixing and conveying pipe.

[0008] The static mixer is equipped with a hydrogen content analyzer.

[0009] The natural gas transmission device includes a natural gas pressure reducing valve and a natural gas filter. The natural gas pressure reducing valve is installed on one side of the mixing and delivery pipe; the natural gas filter is installed on the inlet side of the natural gas pressure reducing valve and is connected to an external natural gas transmission pipeline.

[0010] Both the hydrogen filter and the natural gas filter are equipped with emergency electric shut-off valves at their inlet sides.

[0011] The natural gas-hydrogen co-firing angle tube steam-hot water boiler further includes a regulating mechanism, which includes a hydrogen flow regulating valve and a natural gas flow regulating valve. The hydrogen flow regulating valve is installed on the emergency electric shut-off valve on the gas inlet side of the hydrogen filter; the natural gas flow regulating valve is installed on the emergency electric shut-off valve on the gas inlet side of the natural gas filter.

[0012] This utility model discloses a natural gas-hydrogen co-firing angle tube steam-hot water boiler. In operation, the natural gas transmission device filters and depressurizes the natural gas before supplying it to the mixing and delivery pipe. Further, hydrogen generated by the external device is filtered through a hydrogen filter, depressurized by a hydrogen pressure reducing valve, and then supplied to the mixing and delivery pipe. The mixed gas is then transported through the mixing and delivery pipe to a static mixer for further mixing. Finally, the mixed gas is delivered to the burner of the boiler body. A safety valve provides safety protection after the mixed gas is prepared, and a pressure gauge allows for direct observation of the mixed gas pressure. This allows for the integration of recovered hydrogen into the natural gas for combustion, achieving rational resource utilization and improving boiler combustion efficiency and emission performance, thus facilitating boiler use. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the overall structure of the natural gas-hydrogen co-firing angle tube steam hot water boiler according to the first embodiment of this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of the mixing conveying pipe according to the first embodiment of this utility model.

[0016] Figure 3 This is a schematic diagram of the overall structure of the natural gas-hydrogen co-firing angle tube steam hot water boiler according to the second embodiment of this utility model.

[0017] In the diagram: 101-Boiler body, 102-Static mixer, 103-Mixing delivery pipe, 104-Safety valve, 105-Pressure gauge, 106-Branch pipe, 107-Hydrogen pressure reducing valve, 108-Hydrogen filter, 109-Hydrogen flow meter, 110-Hydrogen content analyzer, 111-Natural gas pressure reducing valve, 112-Natural gas filter, 113-Emergency electric shut-off valve, 201-Hydrogen flow regulating valve, 202-Natural gas flow regulating valve. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0019] Example 1:

[0020] like Figure 1 and Figure 2 As shown, where Figure 1 This is a schematic diagram of the overall structure of a natural gas-hydrogen co-firing corner tube steam-hot water boiler. Figure 2 This is a schematic diagram of the mixing and conveying pipe 103. This utility model provides a natural gas-hydrogen co-firing angle tube steam-hot water boiler: it includes a boiler body 101 and a conveying mechanism. The conveying mechanism includes a static mixer 102, a mixing and conveying pipe 103, a safety valve 104, a pressure gauge 105, a branch pipe 106, a hydrogen pressure reducing valve 107, a hydrogen filter 108, a hydrogen flow meter 109, and a natural gas transmission device. The natural gas transmission device includes a natural gas pressure reducing valve 111 and a natural gas filter 112. This solution allows recovered hydrogen to be mixed with natural gas for combustion, achieving rational resource utilization and helping to improve boiler combustion efficiency and emission performance, thus facilitating boiler use. It is understood that the aforementioned solution can achieve rational resource utilization and helps to improve boiler combustion efficiency and emission performance, thus facilitating boiler use.

[0021] In this embodiment, the boiler body 101 heats water through an internal burner to supply hot water.

[0022] The static mixer 102 is installed outside the air inlet of the burner of the boiler body 101. The mixing and conveying pipe 103 is installed on the air inlet side of the static mixer 102. The safety valve 104 and the pressure gauge 105 are respectively screwed onto the mixing and conveying pipe 103. The branch pipe 106 is welded to the rear of the air inlet side of the mixing and conveying pipe 103. The hydrogen pressure reducing valve 107 is installed on the air inlet side of the branch pipe 106. The hydrogen filter 108 is installed on the air inlet side of the hydrogen pressure reducing valve 107 and is connected to an external hydrogen conveying pipeline. The hydrogen flow meter 109 is installed on the branch pipe 106. The natural gas transmission device is installed on one side of the mixing and conveying pipe 103. The outlet flange of the static mixer 102 is bolted to the inlet of the burner of the boiler body 101, and its inlet flange is connected to the outlet flange of the mixing conveying pipe 103 by screws and nuts. The safety valve 104 is used for mixed gas pressure protection. When the pressure exceeds the safety set value, the safety valve 104 can perform pressure relief protection. The pressure gauge 105 is used to directly observe the pressure value of the mixed gas, which is conducive to rapid inspection. The outlet end of the branch pipe 106 is welded to the mixing conveying pipe 103 to achieve connection. The hydrogen pressure reducing valve 107 is fixed on both sides by screws and nuts. The connecting flanges of the hydrogen filter 108 are fixed by screws and nuts. The hydrogen flow meter 109 is used for flow monitoring during hydrogen transportation. The natural gas transmission device is used for natural gas transmission.

[0023] Secondly, a hydrogen content analyzer 110 is installed on the static mixer 102. The hydrogen content analyzer 110 can be a mature product with existing technology, used to detect the hydrogen content in the mixed gas, and the numerical control can be fed back to the control system.

[0024] Then, the natural gas pressure reducing valve 111 is installed on one side of the mixing and conveying pipe 103; the natural gas filter 112 is installed on the inlet side of the natural gas pressure reducing valve 111 and connected to the external natural gas conveying pipeline. The flanges on both sides of the natural gas pressure reducing valve 111 are fixed by bolts and nuts, and the flanges on both sides of the natural gas filter 112 are connected by bolts and nuts.

[0025] Finally, both the hydrogen filter 108 and the natural gas filter 112 are equipped with emergency electric shut-off valves 113 at their inlet sides. The function of the emergency electric shut-off valves 113 is to allow direct control of the valves to close when an emergency requires the shut-off of natural gas and hydrogen supply.

[0026] This invention enables the rational utilization of resources and helps improve boiler combustion efficiency and emission performance, making boiler use more convenient. During operation, natural gas is filtered and depressurized through the natural gas filter 112 and the natural gas pressure reducing valve 111 before being transported into the mixing and conveying pipe 103. Furthermore, hydrogen generated by external devices is filtered through the hydrogen filter 108 and depressurized by the hydrogen pressure reducing valve 107 before being transported into the mixing and conveying pipe 103. The mixed gas is then transported through the mixing and conveying pipe 103 into the static mixer 102 for mixing. Finally, the mixed gas is transported to the burner of the boiler body 101. The safety valve 104 provides safety protection after the mixed gas is mixed, and the pressure gauge 105 allows for direct observation of the mixed gas pressure. This allows for the mixing of recovered hydrogen into natural gas for combustion, achieving rational resource utilization and improving boiler combustion efficiency and emission performance, thus facilitating boiler use.

[0027] Example 2:

[0028] like Figure 3 As shown, where Figure 3 This is a schematic diagram of the overall structure of a natural gas-hydrogen co-firing corner tube steam-hot water boiler. Based on the first embodiment, this utility model provides a natural gas-hydrogen co-firing corner tube steam-hot water boiler, which also includes an adjustment mechanism, including a hydrogen flow regulating valve 201 and a natural gas flow regulating valve 202.

[0029] The hydrogen flow regulating valve 201 is installed on the emergency electric shut-off valve 113 on the inlet side of the hydrogen filter 108; the natural gas flow regulating valve 202 is installed on the emergency electric shut-off valve 113 on the inlet side of the natural gas filter 112. The connecting flanges on both sides of the hydrogen flow regulating valve 201 and the natural gas flow regulating valve 202 are respectively fixed with screws and nuts, and the inlet sides of both valves are connected to corresponding external gas supply pipelines.

[0030] In this embodiment, the flow rates of the hydrogen and natural gas being transported can be regulated by setting the hydrogen flow regulating valve 201 and the natural gas flow regulating valve 202, respectively.

[0031] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A natural gas-hydrogen co-firing angle tube steam-hot water boiler, comprising a boiler body, characterized in that: It also includes a conveying mechanism; The conveying mechanism includes a static mixer, a mixing and conveying pipe, a safety valve, a pressure gauge, a branch pipe, a hydrogen pressure reducing valve, a hydrogen filter, a hydrogen flow meter, and a natural gas transmission device. The static mixer is installed outside the air inlet of the burner in the boiler body. The mixing and conveying pipe is installed on the air inlet side of the static mixer. The safety valve and the pressure gauge are respectively screwed onto the mixing and conveying pipe. The branch pipe is welded to the rear of the air inlet side of the mixing and conveying pipe. The hydrogen pressure reducing valve is installed on the air inlet side of the branch pipe. The hydrogen filter is installed on the air inlet side of the hydrogen pressure reducing valve and is connected to an external hydrogen conveying pipeline. The hydrogen flow meter is installed on the branch pipe. The natural gas transmission device is installed on one side of the mixing and conveying pipe.

2. The natural gas-hydrogen co-firing angle tube steam-hot water boiler as described in claim 1, characterized in that: The static mixer is equipped with a hydrogen content analyzer.

3. The natural gas-hydrogen co-firing angle tube steam-hot water boiler as described in claim 1, characterized in that: The natural gas transmission device includes a natural gas pressure reducing valve and a natural gas filter. The natural gas pressure reducing valve is installed on one side of the mixing and delivery pipe; the natural gas filter is installed on the inlet side of the natural gas pressure reducing valve and is connected to an external natural gas transmission pipeline.

4. The natural gas-hydrogen co-firing angle tube steam-hot water boiler as described in claim 3, characterized in that: Both the hydrogen filter and the natural gas filter are equipped with emergency electric shut-off valves at their inlet sides.

5. The natural gas-hydrogen co-firing angle tube steam-hot water boiler as described in claim 4, characterized in that... : The natural gas-hydrogen co-firing angle tube steam-hot water boiler also includes a regulating mechanism, which includes a hydrogen flow regulating valve and a natural gas flow regulating valve. The hydrogen flow regulating valve is installed on the emergency electric shut-off valve on the gas inlet side of the hydrogen filter; the natural gas flow regulating valve is installed on the emergency electric shut-off valve on the gas inlet side of the natural gas filter.

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